1.

The vectors barx and bary " satisfy " 2barx +bary =barp and barx+2bary =barq " where " barp=bari+barj and barq=bari-barj. " If " 'theta' " is the angle between " barx and bary, then

Answer»

`COS THETA=4/5`
`cos theta=1/sqrt2`
`cos theta= -4/5`
`cos theta=-3/5`

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